package Lesson.Student;

public class Demo3 {
    public static void main(String[] args) {
        StringBuilder sb = new StringBuilder();

        sb.append("111").append("rga").append("214");
        System.out.println(sb);

        sb.reverse();
        System.out.println(sb);

        int l = sb.length();
        System.out.println(l);

        String str = sb.toString();
        System.out.println(str);
    }
}
